Method and apparatus for transmitting signal in wireless communication system

ABSTRACT

A method for a device to perform a transmission in a wireless communication system, includes transmitting a plurality of transmit power control (TPC) commands and receiving physical uplink shared channel (PUSCH) having transmit power determined using one of the plurality of TPC commands, based on a corresponding PUSCH type, wherein each one of the plurality of TPC commands is related with a respective one of PUSCH types, the PUSCH types are related with PUSCH time lengths, and the PUSCH time lengths include a time length shorter than a single subframe.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.16/517,152, filed on Jul. 19, 2019, which is a Continuation of U.S.patent application Ser. No. 15/577,642, filed Nov. 28, 2017 (now U.S.Pat. No. 10,362,592), which is a National Phase of PCT InternationalApplication No. PCT/KR2016/006688, filed on Jun. 23, 2016, which claimspriority under 35 U.S.C. 119(e) to U.S. Provisional Application No.62/183,701, filed on Jun. 23, 2015, all of these applications are herebyexpressly incorporated by reference into the present application.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a wireless communication system, andmore specifically, to a method for transmitting/receiving a signal and adevice for the same. The wireless communication system can support acarrier aggregation (CA).

Discussion of the Related Art

Wireless communication systems have been widely deployed to providevarious types of communication services including voice and dataservices. In general, a wireless communication system is a multipleaccess system that supports communication among multiple users bysharing available system resources (e.g. bandwidth, transmit power,etc.) among the multiple users. The multiple access system may adopt amultiple access scheme such as Code Division Multiple Access (CDMA),Frequency Division Multiple Access (FDMA), Time Division Multiple Access(TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or SingleCarrier Frequency Division Multiple Access (SC-FDMA).

SUMMARY OF THE INVENTION

An object of the present invention devised to solve the problem lies ina method for efficiently transmitting/receiving a signal in a wirelesscommunication system and a device for the same. Another object of thepresent invention is to provide a method for efficiently controlling atransmission of uplink signal and a device for the same.

The technical problems solved by the present invention are not limitedto the above technical problems and those skilled in the art mayunderstand other technical problems from the following description.

In one aspect of the present invention, provided herein is a method forperforming signal processing by a terminal in a wireless communicationsystem, the method including receiving system information indicating aTime Division Duplex (TDD) uplink-downlink (UL-DL) configuration,receiving Multicast Broadcast Single Frequency Network (MBSFN) subframe(SF) allocation information, and performing signal processing for SF #nbased on a transmission time interval (TTI) configuration of SF #n,wherein SF #n is configured with a single TTI when SF #n is a non-MBSFNSF, and is configured with multiple TTIs when SF #n is an MBSFN SF.

In another aspect of the present invention, provided herein is aterminal used in a wireless communication system, including an radiofrequency (RF) unit, and a processor, wherein the processor isconfigured to receive system information indicating a Time DivisionDuplex (TDD) uplink-downlink (UL-DL) configuration, receive MulticastBroadcast Single Frequency Network (MBSFN) subframe (SF) allocationinformation, and perform signal processing for SF #n based on atransmission time interval (TTI) configuration of SF #n, wherein SF #nis configured with a single TTI when SF #n is a non-MBSFN SF, and isconfigured with multiple TTIs when SF #n is an MBSFN SF.

Preferably, when SF #n is the MBSFN SF, SF #n may include one or more DLintervals and one or more UL intervals corresponding to the multipleTTIs.

Preferably, when SF #n is the MBSFN SF, SF #n may include a plurality ofDL intervals corresponding to the multiple TTIs.

Preferably, the TTI may include 14 OFDMA symbols when SF #n is thenon-MBSFN SF, and include 3 OFDMA symbols when SF #n is the MBSFN SF.

Preferably, the TTI may include two 0.5-ms slots when SF #n is thenon-MBSFN SF, and include one 0.5-ms slot when SF #n is the MBSFN SF.

An object of the present invention devised to solve the problem lies ina method for efficiently transmitting/receiving a signal in a wirelesscommunication system and a device for the same. Another object of thepresent invention is to provide a method for efficiently controlling atransmission of uplink signal and a device for the same.

The effects of the present invention are not limited to theabove-described effects and other effects which are not described hereinwill become apparent to those skilled in the art from the followingdescription.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention, illustrate embodiments of the inventionand together with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 illustrates physical channels used in a 3GPP LTE system, which isan example of wireless communication systems, and a signal transmissionmethod using the same.

FIG. 2 illustrates a radio frame structure;

FIG. 3 illustrates a resource grid of a downlink slot;

FIG. 4 illustrates a downlink subframe structure;

FIG. 5 illustrates an uplink subframe structure;

FIGS. 6 and 7 illustrate TDD UL ACK/NACK (UplinkAcknowledgement/Negative Acknowledgement) transmission timing in asingle cell case;

FIGS. 8 and 9 illustrate TDD PUSCH (Physical Uplink Shared Channel)transmission timing in a single cell case;

FIGS. 10 and 11 illustrate TDD DL ACK/NACK transmission timing in asingle cell case;

FIG. 12 illustrates uplink-downlink frame timing relation;

FIG. 13 illustrates a case that a method of configuring a short DL/UL isapplied to a TDD system;

FIG. 14 illustrates a signal processing procedure according to anexample of the present invention; and

FIG. 15 illustrates a base station (BS) and a user equipment (UE)applicable to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present invention are applicable to a variety ofwireless access technologies such as Code Division Multiple Access(CDMA), Frequency Division Multiple Access (FDMA), Time DivisionMultiple Access (TDMA), Orthogonal Frequency Division Multiple Access(OFDMA), and Single Carrier Frequency Division Multiple Access(SC-FDMA). CDMA can be implemented as a radio technology such asUniversal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can beimplemented as a radio technology such as Global System for Mobilecommunications (GSM)/General Packet Radio Service (GPRS)/Enhanced DataRates for GSM Evolution (EDGE). OFDMA can be implemented as a radiotechnology such as Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwideinteroperability for Microwave Access (WiMAX)), IEEE 802.20, and EvolvedUTRA (E-UTRA). UTRA is a part of Universal Mobile TelecommunicationsSystem (UMTS). 3rd Generation Partnership Project (3GPP) Long TermEvolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA,employing OFDMA for downlink and SC-FDMA for uplink. LTE-Advanced(LTE-A) is evolved from 3GPP LTE. While the following description isgiven, centering on 3GPP LTE/LTE-A for clarity, this is purely exemplaryand thus should not be construed as limiting the present invention.

In a wireless communication system, a UE receives information from a BSon downlink (DL) and transmits information to the BS on uplink (UL).Information transmitted/received between the UE and BS includes data andvarious types of control information, and various physical channels arepresent according to type/purpose of information transmitted/receivedbetween the UE and BS.

FIG. 1 illustrates physical channels used in a 3GPP LTE system and asignal transmission method using the same.

When powered on or when a UE initially enters a cell, the UE performsinitial cell search involving synchronization with a BS in step S101.For initial cell search, the UE synchronizes with the BS and acquireinformation such as a cell Identifier (ID) by receiving a primarysynchronization channel (P-SCH) and a secondary synchronization channel(S-SCH) from the BS. Then the UE may receive broadcast information fromthe cell on a physical broadcast channel (PBCH). In the meantime, the UEmay check a downlink channel status by receiving a downlink referencesignal (DL RS) during initial cell search.

After initial cell search, the UE may acquire more specific systeminformation by receiving a physical downlink control channel (PDCCH) andreceiving a physical downlink shared channel (PDSCH) based oninformation of the PDCCH in step S102.

The UE may perform a random access procedure to access the BS in stepsS103 to S106. For random access, the UE may transmit a preamble to theBS on a physical random access channel (PRACH) (S103) and receive aresponse message for preamble on a PDCCH and a PDSCH corresponding tothe PDCCH (S104). In the case of contention-based random access, the UEmay perform a contention resolution procedure by further transmittingthe PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to thePDCCH (S106).

After the foregoing procedure, the UE may receive a PDCCH/PDSCH (S107)and transmit a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108), as a general downlink/uplink signaltransmission procedure. Here, control information transmitted from theUE to the BS is called uplink control information (UCI). The UCI mayinclude a hybrid automatic repeat and request (HARQ)acknowledgement(ACK)/negative-ACK (HARQ ACK/NACK) signal, a schedulingrequest (SR), channel state information (CSI), etc. The CSI includes achannel quality indicator (CQI), a precoding matrix index (PMI), a rankindicator (RI), etc. While the UCI is transmitted through a PUCCH ingeneral, it may be transmitted through a PUSCH when control informationand traffic data need to be simultaneously transmitted. The UCI may beaperiodically transmitted through a PUSCH at the request/instruction ofa network.

FIG. 2 illustrates a radio frame structure. In a cellular OFDM wirelesspacket communication system, uplink/downlink data packet transmission isperformed on a subframe-by-subframe basis. A subframe is defined as apredetermined time interval including a plurality of OFDM symbols. 3GPPLTE supports a type-1 radio frame structure applicable to FDD (FrequencyDivision Duplex) and a type-2 radio frame structure applicable to TDD(Time Division Duplex).

FIG. 2(a) illustrates a type-1 radio frame structure. A downlinksubframe includes 10 subframes each of which includes 2 slots in thetime domain A time for transmitting a subframe is defined as atransmission time interval (TTI). For example, each subframe has alength of 1 ms and each slot has a length of 0.5 ms. A slot includes aplurality of OFDM symbols in the time domain and includes a plurality ofresource blocks (RBs) in the frequency domain Since downlink uses OFDMin 3GPP LTE, an OFDM symbol represents a symbol period. The OFDM symbolmay be called an SC-FDMA symbol or symbol period. An RB as a resourceallocation unit may include a plurality of consecutive subcarriers inone slot.

The number of OFDM symbols included in one slot may depend on CyclicPrefix (CP) configuration. CPs include an extended CP and a normal CP.When an OFDM symbol is configured with the normal CP, for example, thenumber of OFDM symbols included in one slot may be 7. When an OFDMsymbol is configured with the extended CP, the length of one OFDM symbolincreases, and thus the number of OFDM symbols included in one slot issmaller than that in case of the normal CP. In case of the extended CP,the number of OFDM symbols allocated to one slot may be 6. When achannel state is unstable, such as a case in which a UE moves at a highspeed, the extended CP can be used to reduce inter-symbol interference.

When the normal CP is used, one subframe includes 14 OFDM symbols sinceone slot has 7 OFDM symbols. The first three OFDM symbols at most ineach subframe can be allocated to a PDCCH and the remaining OFDM symbolscan be allocated to a PDSCH.

FIG. 2(b) illustrates a type-2 radio frame structure. The type-2 radioframe includes 2 half frames. Each half frame includes 4(5) normalsubframes and 1(0) special subframe. Normal subframes are used for anuplink or a downlink according to UL-DL configuration. A subframeincludes 2 slots.

Table 1 shows subframe configurations in a radio frame according toUL-DL configuration.

TABLE 1 Downlink-to- Uplink- Uplink downlink Switch-point Subframenumber configuration periodicity 0 1 2 3 4 5 6 7 8 9 0  5 ms D S U U U DS U U U 1  5 ms D S U U D D S U U D 2  5 ms D S U D D D S U D D 3 10 msD S U U U D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D DD D 6  5 ms D S U U U D S U U D

In Table 1, D denotes a downlink subframe, U denotes an uplink subframeand S denotes a special subframe. The special subframe includes DwPTS(Downlink Pilot TimeSlot), GP (Guard Period), and UpPTS (Uplink PilotTimeSlot). DwPTS is used for initial cell search, synchronization orchannel estimation in a UE. UpPTS is used for channel estimation in a BSand UL transmission synchronization acquisition in a UE. The GPeliminates UL interference caused by multi-path delay of a DL signalbetween a UL and a DL.

The radio frame structure is merely exemplary and the number ofsubframes included in the radio frame, the number of slots included in asubframe, and the number of symbols included in a slot can be vary.

FIG. 3 illustrates a resource grid of a downlink slot.

Referring to FIG. 3, a downlink slot includes a plurality of OFDMsymbols in the time domain. One downlink slot may include 7 OFDMsymbols, and one resource block (RB) may include 12 subcarriers in thefrequency domain. However, the present invention is not limited thereto.Each element on the resource grid is referred to as a resource element(RE). One RB includes 12×7 REs. The number NDL of RBs included in thedownlink slot depends on a downlink transmit bandwidth. The structure ofan uplink slot may be same as that of the downlink slot.

FIG. 4 illustrates a downlink subframe structure.

Referring to FIG. 4, a maximum of three (four) OFDM symbols located in afront portion of a first slot within a subframe correspond to a controlregion to which a control channel is allocated. The remaining OFDMsymbols correspond to a data region to which a physical downlink sharedchancel (PDSCH) is allocated. Examples of downlink control channels usedin LTE include a physical control format indicator channel (PCFICH), aphysical downlink control channel (PDCCH), a physical hybrid ARQindicator channel (PHICH), etc. The PCFICH is transmitted at a firstOFDM symbol of a subframe and carries information regarding the numberof OFDM symbols used for transmission of control channels within thesubframe. The PHICH is a response of uplink transmission and carries anHARQ acknowledgment (ACK)/negative-acknowledgment (NACK) signal. Controlinformation transmitted through the PDCCH is referred to as downlinkcontrol information (DCI). The DCI includes uplink or downlinkscheduling information or an uplink transmit power control command foran arbitrary UIE group.

Control information transmitted through a PDCCH is referred to as DCI.Formats 0, 3, 3A and 4 for uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A,2B and 2C for downlink are defined as DCI formats. Information fieldtypes, the number of information fields and the number of bits of eachinformation field depend on DCI format. For example, the DCI formatsselectively include information such as hopping flag, RB allocation, MCS(modulation coding scheme), RV (redundancy version), NDI (new dataindicator), TPC (transmit power control), HARQ process number, PMI(precoding matrix indicator) confirmation as necessary. A DCI format canbe used to transmit control information of two or more types. Forexample, DCI format 0/1A is used to carry DCI format 0 or DCI format 1,which are discriminated from each other by a flag field.

A PDCCH may carry a transport format and a resource allocation of adownlink shared channel (DL-SCH), resource allocation information of anuplink shared channel (UL-SCH), paging information on a paging channel(PCH), system information on the DL-SCH, information on resourceallocation of an upper-layer control message such as a random accessresponse transmitted on the PDSCH, a set of Tx power control commands onindividual UEs within an arbitrary UE group, a Tx power control command,information on activation of a voice over IP (VoIP), etc. A plurality ofPDCCHs can be transmitted within a control region. The UE can monitorthe plurality of PDCCHs. The PDCCH is transmitted on an aggregation ofone or several consecutive control channel elements (CCEs). The CCE is alogical allocation unit used to provide the PDCCH with a coding ratebased on a state of a radio channel. The CCE corresponds to a pluralityof resource element groups (REGs). A format of the PDCCH and the numberof bits of the available PDCCH are determined by the number of CCEs. TheBS determines a PDCCH format according to DCI to be transmitted to theUE, and attaches a cyclic redundancy check (CRC) to control information.The CRC is masked with a unique identifier (referred to as a radionetwork temporary identifier (RNTI)) according to an owner or usage ofthe PDCCH. If the PDCCH is for a specific UE, a unique identifier (e.g.,cell-RNTI (C-RNTI)) of the UE may be masked to the CRC. Alternatively,if the PDCCH is for a paging message, a paging identifier (e.g.,paging-RNTI (P-RNTI)) may be masked to the CRC. If the PDCCH is forsystem information (more specifically, a system information block(SIB)), a system information RNTI (SI-RNTI) may be masked to the CRC.When the PDCCH is for a random access response, a random access-RNTI(RA-RNTI) may be masked to the CRC.

FIG. 5 illustrates an uplink subframe structure used in LTE.

Referring to FIG. 5, a subframe 500 includes two 0.5 ms slots 501. Whena normal CP is used, each slot includes 7 symbols 502 each correspondingto an SC-FDMA symbol. A resource block 503 is a resource allocation unitcorresponding to 12 subcarriers in the frequency domain and to a slot inthe time domain. The uplink subframe is divided into a data region 504and a control region 505. The data region refers to a communicationresource used for a UE to transmit data such as audio data, packets,etc. and includes a PUSCH (physical uplink shared channel). The controlregion refers to a communication resource used for the UE to transmituplink control information (UCI) and includes a PUCCH (physical uplinkcontrol channel).

The PUCCH can be used to transmit the following control information.

-   -   SR (scheduling request): This is information used to request a        UL-SCH resource and is transmitted using On-Off Keying (OOK)        scheme.    -   HARQ ACK: This is a response to a downlink data packet (e.g.        codeword) on a PDSCH and indicates whether the downlink data        packet has been successfully received. A 1-bit ACK/NACK signal        is transmitted as a response to a single downlink codeword and a        2-bit ACK/NACK signal is transmitted as a response to two        downlink codewords. A HARQ-ACK response includes positive ACK        (simply, ACK), negative ACK (NACK), DTX or NACK/DTX. Here,        HARQ-ACK is used interchangeably with HARQ ACK/NACK and        ACK/NACK.    -   CSI (channel state information): This is feedback information        about a downlink channel Feedback information regarding multiple        input multiple output (MIMO) includes rank indicator (RI) and        precoding matrix index (PMI). 20 bits are used for each        subframe.

The quantity of control information that a UE can transmit through asubframe depends on the number of SC-FDMA symbols available for controlinformation transmission. The SC-FDMA symbols available for controlinformation transmission correspond to SC-FDMA symbols other thanSC-FDMA symbols of the subframe, which are used for reference signaltransmission. In the case of a subframe in which a sounding referencesignal (SRS) is configured, the last SC-FDMA symbol of the subframe isexcluded from the SC-FDMA symbols available for control informationtransmission. A reference signal is used to detect coherence of thePUCCH. The PUCCH supports various formats according to informationtransmitted thereon.

Table 2 shows the mapping relationship between PUCCH formats and UCI inLTE(-A).

TABLE 2 PUCCH format UCI (Uplink Control Information) Format 1 SR(Scheduling Request) (non-modulated waveform Format 1a 1-bit HARQACK/NACK (SR exist/non-exist) Format 1b 2-bit HARQ ACK/NACK (SRexist/non-exist) Format 2 CQI (20 coded bits) Format 2 CQI and 1- or2-bit HARQ ACK/NACK (20 bits) (corresponding to only extended CP) Format2a CQI and 1-bit HARQ ACK/NACK (20 + 1 coded bits) Format 2b CQI and2-bit HARQ ACK/NACK (20 + 2 coded bits) Format 3 Up to 24-bit HARQACK/NACK + SR (LTE-A)

An SRS is transmitted through the last SC-FDMA symbol of the subframe(506). SRSs of multiple UEs, transmitted through the same SC-FDMAsymbol, can be discriminated according to frequency position/sequence.The SRS is transmitted aperiodically or periodically.

A description will be given of TDD signal transmission timing in asingle carrier (or cell) situation with reference to FIGS. 6 to 11.

FIGS. 6 and 7 illustrate PDSCH-UL ACK/NACK timing. Here, UL ACK/NACKmeans ACK/NACK transmitted on uplink, as a response to DL data (e.g.PDSCH).

Referring to FIG. 6, a UE can receive one or more PDSCH signals in M DLsubframes (SFs) (S502_0 to S502_M−1). Each PDSCH signal is used totransmit one or more (e.g. 2) transport blocks (TBs) according totransmission mode. A PDCCH signal indicating SPS (Semi-PersistentScheduling) may also be received in step S502_0 to S502_M−1, which isnot shown. When a PDSCH signal and/or an SPS release PDCCH signal ispresent in the M DL subframes, the UE transmits ACK/NACK through a ULsubframe corresponding to the M DL subframes via processes fortransmitting ACK/NACK (e.g. ACK/NACK (payload) generation, ACK/NACKresource allocation, etc.) (S504). ACK/NACK includes acknowledgementinformation about the PDSCH signal and/or an SPS release PDCCH receivedin step S502_0 to S502_M−1. While ACK/NACK is transmitted through aPUCCH basically, ACK/NACK is transmitted through a PUSCH when a PUSCH istransmitted at ACK/NACK transmission time. Various PUCCH formats shownin Table 2 can be used for ACK/NACK transmission. To reduce the numberof ACK/NACK bits transmitted through a PUCCH format, various methodssuch as ACK/NACK bundling and ACK/NACK channel selection can be used.

As described above, in TDD, ACK/NACK relating to data received in the MDL subframes is transmitted through one UL subframe (i.e. M DL SF(s): 1UL SF) and the relationship therebetween is determined by a DASI(Downlink Association Set Index).

Table 3 shows DASI (K: {k₀, k₁, . . . , k_(M-1)}) defined in LTE(-A).Table 3 shows spacing between a UL subframe transmitting ACK/NACK and aDL subframe relating to the UL subframe. Specifically, when a PDCCH thatindicates PDSCH transmission and/or SPS release is present in a subframen-k (k∈K), the UE transmits ACK/NACK in a subframe n.

TABLE 3 TDD UL-DL Config- Subframe n uration 0 1 2 3 4 5 6 7 8 9 0 — — 6— 4 — — 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, 6 — — — — 8, 7,4, 6 — — 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 11 6, 5, 4,7 — — — — — — 5 — — 13, 12, 9, 8, — — — — — — — 7, 5, 4, 11, 6 6 — — 7 75 — — 7 7 —

FIG. 7 illustrates UL ACK/NACK transmission timing when UL-DLconfiguration #1 is configured. In the figure, SF #0 to #9 and SF #10 to#19 respectively correspond to radio frames, and numerals in blocksdenote UL subframes relating to DL subframes. For example, ACK/NACK fora PDSCH of SF #5 is transmitted in SF #5+7 (=SF #12) and ACK/NACK for aPDSCH of SF #6 is transmitted in SF #6+6 (=SF #12). Accordingly, bothACKs/NACKs for DL signals of SF #5/#6 are transmitted in SF #12.Similarly, ACK/NACK for a PDSCH of SF #14 is transmitted in SF #14+4(=SF #18).

FIGS. 8 and 9 illustrate PHICH grant-PUSCH timing. A PUSCH can betransmitted corresponding to a PDCCH (UL grant) and/or a PHICH (NACK).

Referring to FIG. 8, the UE can receive a PDCCH (UL grant) and/or aPHICH (NACK) through a PDCCH (S702). Here, NACK corresponds to anACK/NACK response to previous PUSCH transmission. In this case, the UEcan initially transmit/retransmit one or more TBs through a PUSCH afterk subframes via processes for PUSCH transmission (e.g. TB coding, TB-CWswiping, PUSCH resource allocation, etc.) (S704). The present embodimentis based on the assumption that a normal HARQ operation in which a PUSCHis transmitted once is performed. In this case, a PHICH and a UL grantcorresponding to PUSCH transmission are present in the same subframe.However, in case of subframe bundling in which a PUSCH is transmittedmultiple times through a plurality of subframes, a PHICH and a UL grantcorresponding to PUSCH transmission may be present in differentsubframes.

Table 4 shows a UAI (Unlink Association Index) (k) for PUSCHtransmission in LTE(-A). Table 4 shows spacing between a DL subframefrom which a PHICH/UL grant is detected and a UL subframe relating tothe DL subframe. Specifically, when a PHICH/UL grant is detected from asubframe n, the UE can transmit a PUSCH in a subframe n+k.

TABLE 4 TDD UL-DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 9 04 6 4 6 1 6 4 6 4 2 4 4 3 4 4 4 4 4 4 5 4 6 7 7 7 7 5

FIG. 9 illustrates PUSCH transmission timing when UL-DL configuration #1is configured. In the figure, SF #0 to #9 and SF #10 to #19 respectivelycorrespond to radio frames, and numerals in blocks denote UL subframesrelating to DL subframes. For example, a PUSCH corresponding to PHICH/ULgrant of SF #6 is transmitted in SF #6+6 (=SF #12) and a PUSCHcorresponding to a PHICH/UL grant of SF #14 is transmitted in SF #14+4(=SF #18).

FIGS. 10 and 11 illustrate PUSCH-PHICH/UL grant timing. A PHICH is usedto transmit DL ACK/NACK. Here, DL ACK/NACK means ACK/NACK transmitted ondownlink as a response to UL data (e.g. PUSCH).

Referring to FIG. 10, the UE transmits a PUSCH signal to the BS (S902).Here, the PUSCH signal is used to transmit one or a plurality of (e.g.2) TBs according to transmission mode. The BS can transmit ACK/NACK as aresponse to PUSCH transmission through a PHICH after k subframes viaprocesses for ACK/NACK transmission (e.g. ACK/NACK generation, ACK/NACKresource allocation, etc.) (S904). ACK/NACK includes acknowledgementinformation about the PUSCH signal of step S902. When a response toPUSCH transmission is NACK, the BS can transmit a UL grant PDCCH forPUSCH retransmission to the UE after k subframe (S904). The presentembodiment is based on the assumption that a normal HARQ operation inwhich a PUSCH is transmitted once is performed. In this case, a PHICHand UL grant used for PUSCH transmission can be transmitted in the samesubframe. In case of subframe bundling, however, the PHICH and UL grantused for PUSCH transmission can be transmitted in different subframes.

Table 5 shows a UAI for PHICH/UL grant transmission in LTE(-A). Table 5shows spacing between a DL subframe in which a PHICH/UL grant is presentand a UL subframe relating to the DL subframe. Specifically, a PHICH/ULgrant of a subframe i corresponds to PUSCH transmission through asubframe i-k.

TABLE 5 TDD UL-DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 9 07 4 7 4 1 4 6 4 6 2 6 6 3 6 6 6 4 6 6 5 6 6 6 4 7 4 6

FIG. 11 illustrates PHICH/UL grant transmission timing when UL-DLconfiguration #1 is configured. In the figure, SF #0 to #9 and SF #10 to#19 respectively correspond to radio frames, and numerals in blocksdenote DL subframes relating to UL subframes. For example, a PHICH/ULgrant corresponding to a PUSCH of SF #2 is transmitted in SF #2+4 (=SF#6) and a PHICH/UL grant corresponding to a PUSCH of SF #8 istransmitted in SF #8+6 (=SF #14).

PHICH resource allocation will now be described. When a PUSCH istransmitted in subframe #n, the UE determines a PHICH resourcecorresponding to the PUSCH in subframe #(n+kPHICH). In case of FDD,kPHICH has a fixed value (e.g. 4). In case of TDD, kPHICH has a valuedepending on UL-DL configuration. Table 6 shows kPHICH for TDD isequivalent to Table 5.

TABLE 6 TDD UL-DL UL subframe index n Configuration 0 1 2 3 4 5 6 7 8 90 4 7 6 4 7 6 1 4 6 4 6 2 6 6 3 6 6 6 4 6 6 5 6 6 4 6 6 4 7

A PHICH resource is provided by [PHICH group index, orthogonal sequenceindex]. The PHICH group index and the orthogonal sequence index aredetermined using (i) a lowest PRB index used for PUSCH transmission and(ii) a 3-bit field value for DMRS (Demodulation Reference Signal) cyclicshift. Here, (i) and (ii) are indicated by a UL grant PDCCH.

FIG. 12 illustrates uplink-downlink frame timing relation.

Referring to FIG. 12, transmission of the uplink radio frame number istarts prior to (N_(TA)+N_(TAoffset))*T_(s) seconds from the start ofthe corresponding downlink radio frame. In case of the LTE system,O≤N_(TA)≤20512, N_(TAoffset)=0 in FDD, and N_(TAoffset)=624 in TDD. Thevalue N_(Taoffset) is a value in advance recognized by the BS and theUE. If N_(TA) is indicated through a timing advance command during arandom access procedure, the UE adjusts transmission timing of UL signal(e.g., PUCCH/PUSCH/SRS) through the above equation. UL transmissiontiming is set to multiples of 16T_(s). The timing advance commandindicates the change of the UL timing based on the current UL timing.The timing advance command T_(A) within the random access response is a11-bit timing advance command, and indicates values of 0, 1, 2, . . . ,1282 and a timing adjustment value is given by N_(TA)=T_(A)*16. In othercases, the timing advance command T_(A) is a 6-bit timing advancecommand, and indicates values of 0, 1, 2, . . . , 63 and a timingadjustment value is given by N_(TA,new)=N_(TA,old)+(T_(A)−31)*16. Thetiming advance command received at subframe n is applied from thebeginning of subframe n+6. In case of FDD, as shown, transmitting timingof UL subframe n is advanced based on the start time of the DL subframen. On the contrary, in case of TDD, transmitting timing of UL subframe nis advanced based on the end time of the DL subframe n+1 (not shown).

Embodiment: Short DL/UL

In the next system after LTE-A, low latency-based control and datatransmission may be considered. To this end, a time unit (e.g., atransmission time unit (TTI)) for performing transmission and receptionof a single DL/UL datum (e.g., a DL/UL-SCH transport block) should beshorter than the existing single SF (i.e., 1 ms). For example, for lowlatency-based control and data transmission, the TTI may have to beconfigured with three OFDMA/SC-FDMA symbols or one slot duration. Forconvenience, the following terms are defined.

short TU: Indicates a time unit (i.e., TTI) in whichtransmission/reception of a single DL/UL datum (e.g., transport block)is performed. For low-latency transmission, the short TU is set to beshorter than the TTI (i.e., 1 SF=1 ms) of the legacy system (e.g.,LTE/LTE-A). For example, the short TU may be set to three OFDMA/SC-FDMAsymbols or one slot duration. For simplicity, the TTI of the legacysystem is referred to as a normal TTI and the short TU is referred to asa short TTI.

short DL: Represents a DL duration consisting of one short TU.

short UL: Represents a UL duration consisting of one short TU.

short TI: Represents the (minimum) time interval/latency between controlinformation and data (see FIGS. 6 to 11). For example, the short TI mayrepresent (i) the (minimum) time interval/latency between a DL datareception time and a HARQ-ACK transmission time through short DL (seeFIG. 6), or (ii) the (minimum) time interval/latency between a DL grantreception time through short DL and a UL data transmission time throughshort UL (see FIG. 8). The short TI may be expressed as a time intervalbetween a short DL/UL and a short UL/DL. For low-latency transmission,the short TI may be set to be shorter than the time interval (e.g., 4SFs=4 ms) of the legacy system (e.g., LTE/LTE-A). As an example, a shortTI may be set to one or two SF intervals (e.g., 1 ms or 2 ms).

In the conventional TDD system (e.g., LTE/LTE-A), a 1-ms SF isconfigured based on the UL-DL configuration (see Table 1) broadcastthrough the SIB. To configure a short TU in the conventional TDD system,a short DL may be inserted only in the DL SF and a short UL may beinserted only in the UL SF. However, in this method, the short DL/UL isconfigured depending only on the UL-DL configuration-based SF structure,and thus it is not easy to support (secure and maintain) a short TIbetween the control information and the data (i.e., between the shortDL/UL and the short UL/DL) due to a duration having a plurality ofcontiguous identical (DL or UL) SFs. For example, in the case of TDDUL-DL configuration #1, the SF configuration is set to [D S U U D D S UU D] in units of radio frames. When the method described above isapplied to this case, the DL SFs and the UL SFs are contiguous at leasttwice respectively, and therefore it may be difficult to secure a shortTI of 2 ms or less (e.g. 1 ms). Here, D, S and U denote DL SF, S(special) SF and UL SF, respectively (see Table 1).

Hereinafter, the present invention proposes a method of configuring ashort TU for low latency-based control and data transmission in a TDDsystem. More specifically, a method of configuring a short DL and ashort UL to support the short TI between control information and data inthe conventional UL/DL SF configuration-based TDD system is discussed.HARQ-ACK for the DL data received through the short DL or UL datacorresponding to the UL grant DCI/PHICH detected through the short DLmay be transmitted through a short UL after the short TI (or within acertain time) from the short DL. A (retransmission) DL grant DCI for theDL data corresponding to HARQ-ACK (e.g., NACK) transmitted through shortUL, or a PHICH/UL grant DCI corresponding to the UL data transmittedthrough a short DL after the short TI (or within a certain time) fromthe short UL.

In the following description, a case where the short UL/DL is configuredin an existing SF is exemplarily disclosed, but the SF is merely anexample of a time duration capable of including a plurality of shortTUs. Therefore, in the following description, the SF may be generalizedto any time interval (e.g., slot, radio frame, DL interval, UL interval,etc.) including a plurality of short TUs e.g., slot, radio frame, DLinterval, UL interval, etc.).

(1) Configuring a Short DL in a UL SF (Method 1)

One or a plurality of short DLs may be configured in one existing UL SF.Specifically, Opt 1) one or more short DLs may be configured over one ULSF in the time domain, Opt 2) one or more short DLs may be configuredover the interval excluding some symbols (the first few symbols and/orthe last few symbols) in the UL SF. The symbols include an OFDAM symbolor an SC-FDMA symbol. The symbol interval excluded from Opt 2 may Alt 1)be used/configured as a gap for switching between DL and UL, or Alt 2)be used to transmit a specific UL signal (e.g., SRS) configured in theoriginal UL SF or separately configured for a short TU operation UE. Theabove method may be similarly used in configuring one or a plurality ofshort ULs in one UL SF.

Meanwhile, UL SF information in which the short DL is configured orconfigurable may be configured for a UE, and the UE may perform DLsignal/channel detection and reception operations for the short DL(e.g., detection of DL/UL grant DCI for scheduling short DL/UL,reception of DL data scheduled on short DL, etc.) in a specificsituation. For example, if there is no scheduling/configuration of a ULsignal/channel in a specific UL SF (and/or a UL SF immediately adjacentto the specific UL SF), the UE may attempt to detect/receive DL (e.g.,DL/UL grant DCI, etc.) for the short DL in the UL SF. As anotherexample, if the UE has transmitted HARQ-ACK or UL data through aspecific short UL, the UE may attempt to detect/receive DL (e.g., DL/ULgrant DCI for scheduling DL/UL data (re-)transmission, PHICH, etc.) forthe short DL in a UL SF at a time (or within a certain time) after theshort TI from the short UL.

(2) Configuring a Short UL in a DL SF (Method 2)

One or a plurality of short ULs may be configured in one existing DL SF.Specifically, while a DL SF is configured as a (fake) MBSFN (MulticastBroadcast Single Frequency Network) SF, one or more short ULs may beconfigured in the interval excluding a few initial symbols (or a firstpart of the symbols and a last part of the symbols) in the DL SF. TheMBSFN SF is divided into a non-MBSFN region and an MBSFN region. Thenon-MBSFN region is composed of first one or two OFDMA symbols in theMBSFN SF and the MBSFN region is composed of OFDMA symbols not used forthe non-MBSFN region in the MBSFN SF. Since the existing UE reads onlythe non-MBSFN region in the MBSFN SF, the short UL may be configured inthe MBSFN region so as not to affect the existing UEs. That is, aspecific DL SF may be configured as an MBSFN SF (fake MBSFN SF) for thepurpose of configuring a short UL instead of the MBSFN service. TheMBSFN SF is indicated using a bitmap and is repeated periodically. Thefirst few symbols excluded from short UL configuration in the DL SF maybe used/configured for control transmission (e.g., PDCCH, PHICH, etc.)and a DL/UL switching gap for an existing UE operating only in the TTI(and/or a UE for which the short TU operation is configured). Alt ½ ofMethod 1 may be applied to the last few symbols excluded from short ULconfiguration in the DL SF. The above method may be similarly used inconfiguring one or a plurality of short DLs in one DL SF.

DL SF (configured as MBSFN SF) information in which the short UL isconfigured or configurable may be configured for a UE, and the UE mayperform UL signal/channel transmission operation (e.g., HARQ-ACKtransmission for DL data reception in the short DL, UL data transmissionscheduled from the short DL, etc.) through the short UL in the DL SF ina specific situation. For example, when the UE receives DL data or ULgrant DCI (and/or PHICH) through a specific short DL, the UE may performtransmission of UL (e.g., HARQ-ACK for DL data reception, UL datacorresponding to UL grant DCI/PHICH, etc.) through an MBSFN DL SF afterthe short TI (or within a certain time) from the short DL.

(3) Configuring a Short DL in an S SF (Method 3)

One or a plurality of short DLs may be configured in one existing S SF.Specifically, one or more short DLs may be configured in the intervalexcluding some symbols (the first few symbols and/or the last fewsymbols) in the S SF. The first few symbols excluded from short DLconfiguration in the S SF may be used/configured for controltransmission (e.g., PDCCH, PHICH, etc.) for the existing TTI operationUE (and/or the short TU operation UE). Alt ½ of Method 1 may be appliedto the last few symbols excluded from short DL configuration in the SSF. In the case of a specific short DL, all or a part of the symbolsconstituting the short DL may be outside the DwPTS interval originallyconfigured in the S SF, or may overlap the UpPTS interval.

Meanwhile, S SF information in which the short DL is configured orconfigurable may be configured for a UE, and the UE may perform DLsignal/channel detection and reception operations for the short DL(e.g., detection of DL/UL grant DCI for scheduling short DL/UL,reception of DL data scheduled on short DL, etc.) in a specificsituation. For example, if there is no scheduling/configuration of a ULsignal/channel in a specific S SF (and/or a UL SF immediately adjacentto the specific SF), the UE may attempt to detect/receive DL (e.g.,DL/UL grant DCI, etc.) for the short DL in the S SF. As another example,if the UE has transmitted HARQ-ACK or UL data through a specific shortUL, the UE may attempt to detect/receive DL (e.g., DL/UL grant DCI forscheduling DL/UL data (re-)transmission, PHICH, etc.) for the short DLin an S SF at a time (or within a certain time) after the short TI fromthe short UL.

(4) Configuring a Short UL in an S SF (Method 4)

One or a plurality of short ULs may be configured in one existing S SF.

Specifically, one or more short ULs may be configured in the intervalexcluding some symbols (the first few symbols and/or the last fewsymbols) in the S SF. The first few symbols excluded from short ULconfiguration in the S SF may be used/configured for controltransmission (e.g., PDCCH, PHICH, etc.) and a DL/UL switching gap forthe existing TTI operation UE (and/or the short TU operation UE). Alt ½of Method 1 may be applied to the last few symbols excluded from shortUL configuration in the S SF. In addition, for short UL configuration inthe S SF, the S SF configuration is preferably set to have the shortestDwPTS interval (e.g., three-symbol interval). In the case of a specificshort UL, all or a part of the symbols constituting the short UL may beoutside the DwPTS interval originally configured in the S SF, or mayoverlap the UpPTS interval.

Table 7 shows the DwPTS/GP/UpPTS length according to S SFconfigurations. In S SF configurations #0 and #5, DwPTS consists ofthree symbols. In the other SF configurations, DwPTS consists of morethan three symbols.

TABLE 7 Normal cyclic prefix in downlink Extended cyclic prefix indownlink UpPTS UpPTS Normal Extended Normal Extended cyclic cycliccyclic cyclic Special prefix prefix prefix prefix subframe in in in inconfiguration DwPTS uplink uplink DwPTS uplink uplink 0  6592 · T_(S)2192 · T_(S) 2560 · T_(S)  7680 · T_(S) 2192 · T_(S) 2560 · T_(S) 119760 · T_(S) 20480 · T_(S) 2 21952 · T_(S) 23040 · T_(S) 3 24144 ·T_(S) 25600 · T_(S) 4 26336 · T_(S)  7680 · T_(S) 4384 · T_(S) 5120 ·T_(S) 5  6592 · T_(S) 4384 · T_(S) 5120 · T_(S) 20480 · T_(S) 6 19760 ·T_(S) 23040 · T_(S) 7 21952 · T_(S) — — — 8 24144 · T_(S) — — —

Meanwhile, S SF information in which the short DL is configured orconfigurable may be configured for a UE, and the UE may perform ULsignal/channel transmission operation (e.g., HARQ-ACK transmission forDL data reception in the short DL, UL data transmission scheduled fromthe short DL, etc.) through the short UL in the S SF in a specificsituation. For example, when the UE receives DL data or UL grant DCI(and/or PHICH) through a specific short DL, the UE may performtransmission of UL (e.g., HARQ-ACK for DL data reception, UL datacorresponding to UL grant DCI/PHICH, etc.) through the S SF after theshort TI (or within a certain time) from the short DL.

FIG. 13 illustrates a short UL/DL configuration according to anembodiment of the present invention. FIG. 13 illustrates a case that amethod of configuring a short DL/UL is applied to a TDD system having anSF configuration based on UL-DL configuration #1. In the figure, it isassumed that four short TU intervals (e.g., 0.25 ms) are equal to one SFinterval, and the short TI is 1 ms (or one SF or four short TUintervals). As shown in the figure, Method 3-based short DLconfiguration method may be applied to the S of SF #1, and Method1-based short DL configuration method may be applied to the U of SF #3.Method 2-based short UL may be applied to the D of SF #4, and a Method4-based short UL configuration method may be applied to the S of SF #6.The figure represents a case where all of Methods 1 to 4 are combined.However, this is simply an example, and Methods 1 to 4 may be usedindependently or in any combination. In the figure, {d0, u0, d2, u2, d4,u4, d6, u6, d8} on short TU numbers may be considered as correspondingto short DL/UL set at short TI intervals, and {d1, u1, d3, u3, d5, u5,d7, u7, d9} may be considered as another corresponding short DL/UL setat short TI intervals. In the figure, “changeable/unchangeable”indicates whether short UL configuration is possible.

The short DL/UL of the present invention may be configured over theentire system bandwidth (BW) or only in a specific frequency (e.g., RB)region smaller than the system BW.

FIG. 14 illustrates a signal processing procedure according to anexample of the present invention.

Referring to FIG. 14, the UE may receive system information indicating aTDD UL-DL configuration (S1402). The TDD UL-DL configuration representsan SF configuration of a radio frame (see Table 1). When a plurality ofcells is merged for a UE based on carrier aggregation (CA), a TDD UL-DLconfiguration may be indicated for each cell. Then, the UE may check theTTI configuration of SF #n (S1404). The TTI configuration of SF #n maybe a normal TTI or a short TTI. The normal TTI is a TTI of a legacysystem (e.g., LTE/LTE-A) and has a length of one SF interval (i.e., 1ms). On the other hand, the short TTI may be set to be shorter than theTTI of the legacy system (e.g., LTE/LTE-A). For example, the TU may beset to three OFDMA/SC-FDMA symbols or one slot interval (i.e., 0.5 ms).If the TTI configuration of SF #n is the normal TTI, the UE may performthe signal processing procedure on the assumption that SF #n is composedof one TTI (S1406 a). In this case, transmission/reception of DL/UL datamay be performed on an SF-by-SF basis. On the other hand, if the TTIconfiguration of SF #n is the short TTI, the UE may perform the signalprocessing procedure on the assumption that SF #n is composed ofmultiple TTIs (S1406 b). Here, the signal processing procedure includessignal processing for transmitting and receiving signals through variousphysical channels of FIG. 1. For example, the signal processingprocedure includes (i) a signal processing process for receiving a DLgrant and receiving corresponding DL data, (ii) a signal processingprocess for receiving DL data and transmitting a corresponding HARQ-ACK,and (iii) a signal processing process for receiving a UL grant/PHICH andtransmitting corresponding UL data. Here, transmission/reception ofDL/UL data may be performed in units shorter than the SF. Configuringand signaling a short TTI in SF #n may conform to Methods 1 to 4. Forexample, the short TTI configuration in SF #n may be established asshown in FIG. 13.

(5) Scheme of Controlling Inter-Cell Interference Due to Short DL/ULConfiguration

When a short DL/UL is configured in a UL/DL SF configured in theconventional TDD system, it may be preferable to consider the influenceof interference from an adjacent cell or on an adjacent cell. Forexample, if presence/absence of a short DL/UL configuration and relatedinformation are not exchanged/shared among adjacent cells, or a shortDL/UL configuration pattern for each SF is not tightly shared in realtime, significant performance degradation may be caused to the entiresystem due to interference between the short DL/UL (without a shortDL/UL configured) and the normal UL/DL.

To address this issue, information such as whether the short DL/UL isconfigured and (candidate) SFs configurable with a short DL/UL (and/or a(candidate) frequency (e.g., RB) region configurable with short DL/UL)may be exchanged through signaling. In addition, an independent UL PC(Power Control) process separate from the normal UL SF may be performedfor all short ULs or a specific short UL (e.g., a short UL configured ina DL (or S) SF), and the timing advance (TA) may also be independentlyset/controlled only for the corresponding short UL. In detail, open-loopPC parameters (e.g., PO_PUSCH, alpha, PO_PUCCH-related parameters)applied to PUSCH and PUCCH transmission in a short UL may beindependently set (apart from the normal UL SF). In addition, the TPCcommand may be accumulated independently for the short UL (separatelyfrom the normal UL SF). Alternatively, the UL PC process (e.g., settingof open loop PC parameters, application of the TPC command, etc.) may beperformed in common for the short UL and the normal UL SF, but aspecific power offset may be added/applied to the UL transmit power inthe short UL.

An independent UL PC process separate from the other UL SFs (notincluding the short DL) may be performed for a specific UL (or S) SF(which may include, for example, a short DL). In addition, independentopen-loop PC parameter setting and TPC command accumulation operationsmay be performed for UL transmission in the specific UL (or S) SF(separately from the other normal UL SFs). Further, the UL PC processmay be performed in common for all UL SFs, and a specific power offsetmay be added/applied to the UL transmit power in the specific UL (or S)SF.

The proposed method of the present invention is not limited to the TDDsystem. Even when the short UL is configured/set in any DL SF and/or theshort DL is configured/set in any UL SF, the proposed may be may bemodified and used. For example, using the proposed method in the FDDsystem environment, a short UL may be configured/set in a specific DL SFon the DL carrier and/or a short DL may be configured/set in a specificUL SF on the UL carrier.

FIG. 15 illustrates a BS, a relay and a UE applicable to the presentinvention.

Referring to FIG. 15, a wireless communication system includes a BS 110and a UE 120. When the wireless communication system includes a relay,the BS or UE can be replaced by the relay.

The BS includes a processor 112, a memory 114, an RF unit 116. Theprocessor 112 may be configured to implement the procedures and/ormethods proposed by the present invention. The memory 114 is connectedto the processor 112 and stores information related to operations of theprocessor 112. The RF unit 116 is connected to the processor 112,transmits and/or receives an RF signal. The UE 120 includes a processor122, a memory 124, and an RF unit 126. The processor 112 may beconfigured to implement the procedures and/or methods proposed by thepresent invention. The memory 124 is connected to the processor 122 andstores information related to operations of the processor 122. The RFunit 126 is connected to the processor 122, transmits and/or receives anRF signal.

The embodiments of the present invention described hereinbelow arecombinations of elements and features of the present invention. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent invention may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent invention may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It will beobvious to those skilled in the art that claims that are not explicitlycited in each other in the appended claims may be presented incombination as an embodiment of the present invention or included as anew claim by a subsequent amendment after the application is filed.

In the embodiments of the present invention, a description is madecentering on a data transmission and reception relationship among a BS,a relay, and an MS. In some cases, a specific operation described asperformed by the BS may be performed by an upper node of the BS. Namely,it is apparent that, in a network comprised of a plurality of networknodes including a BS, various operations performed for communicationwith an MS may be performed by the BS, or network nodes other than theBS. The term ‘BS’ may be replaced with the term ‘fixed station’, ‘NodeB’, ‘enhanced Node B (eNode B or eNB)’, ‘access point’, etc. The term‘UE’ may be replaced with the term ‘Mobile Station (MS)’, ‘MobileSubscriber Station (MSS)’, ‘mobile terminal’, etc.

The embodiments of the present invention may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present invention may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the embodiments of the presentinvention may be implemented in the form of a module, a procedure, afunction, etc. For example, software code may be stored in a memory unitand executed by a processor. The memory unit is located at the interioror exterior of the processor and may transmit and receive data to andfrom the processor via various known means.

Those skilled in the art will appreciate that the present invention maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent invention. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of theinvention should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

The present invention is applicable to a UE, BS or other devices of awireless mobile communication system. Specifically, the presentinvention is applicable to a method for transmitting uplink controlinformation and an apparatus for the same.

What is claimed is:
 1. A method for a device to perform a transmissionin a wireless communication system, the method comprising: transmittinga plurality of transmit power control (TPC) commands; and receivingphysical uplink shared channel (PUSCH) having transmit power determinedusing one of the plurality of TPC commands, based on a correspondingPUSCH type, wherein each one of the plurality of TPC commands is relatedwith a respective one of PUSCH types, and the PUSCH types are relatedwith PUSCH time lengths, and wherein the PUSCH time lengths include atime length shorter than a single subframe.
 2. The method of claim 1,wherein the PUSCH types include a first PUSCH type with a length of 1 msand a second PUSCH type with a length of 0.5 ms or less.
 3. The methodof claim 2, wherein the first PUSCH type includes 14 symbols, and thesecond PUSCH type includes 7 or less symbols.
 4. The method of claim 1,wherein the plurality of TPC commands is related with power control fora same time duration.
 5. The method of claim 2, wherein PUSCHs of thefirst PUSCH type and the second PUSCH type are allocated in a same timeduration.
 6. A device usable in a wireless communication system, thedevice comprising: a transceiver; and a processor connected to thetransceiver, wherein the processor is configured to: transmit aplurality of transmit power control (TPC) commands; and receive physicaluplink shared channel (PUSCH) having transmit power determined using oneof the plurality of TPC commands, based on a corresponding PUSCH type,wherein each one of the plurality of TPC commands is related with arespective one of PUSCH types, and the PUSCH types are related withPUSCH time lengths, and wherein the PUSCH time lengths include a timelength shorter than a single subframe.
 7. The device of claim 6, whereinthe PUSCH types include a first PUSCH type with a length of 1 ms and asecond PUSCH type with a length of 0.5 ms or less.
 8. The device ofclaim 7, wherein the first PUSCH type includes 14 symbols, and thesecond PUSCH type includes 7 or less symbols.
 9. The device of claim 6,wherein the plurality of TPC commands is related with power control fora same time duration.
 10. The device of claim 7, wherein PUSCHs of thefirst PUSCH type and the second PUSCH type are allocated in a same timeduration.